A method of manufacturing a paper container, where a parallelepiped inner body in the form of a box having no top panel board from a first blank sheet of corrugated board or card board is first fashioned. An outer body by packaging the inner body with a second blank sheet in such a manner that said outer body is in close contact with the outside of the inner body is then made. Finally, a continuous cut in the outer body is made to divide the outer body into the upper part and the lower part so that said upper part of the outer body can be detachably mounted on the inner body.